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Old 4th May 2019, 11:16
  #19 (permalink)  
Join Date: Mar 2000
Location: Sunrise Senior Living
Posts: 1,298
Folks, the APU starts from the DC BAT Bus which is not powered in EMER ELEC - unless the APU Master is pressed. So, as someone has said above, every APU start in the A320 CEO is from the batteries. I have no knowledge of other variants.
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